TDD Frame Timing Synchronization via Peak Power Alignment
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Solution Overview
Problem
Time-Division Duplexing (TDD) networks face interference issues due to overlapping uplink and downlink timeslots, particularly in multi-operator deployments, where existing synchronization techniques are costly, unsuitable for small cells, or introduce inaccuracies, and result in suboptimal frame structures.
Innovation Solution
A method that aligns TDD transmission frames by allocating higher transmit power to specific resource slots within the frame, synchronizing them with the peak power of received transmissions, allowing for flexible frame structures and reduced interference without the need for additional hardware or backhaul costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If backhaul synchronization techniques (NTP, SynchE, IEEE-1588v2) are used to achieve sub-microsecond synchronization, then timing alignment precision is improved, but device complexity and backhaul infrastructure costs increase
Solution Approach 1:
The system performs self-synchronization by detecting peak power levels in received TDD transmissions and autonomously aligning its own transmission frames without requiring external synchronization infrastructure. Each node independently determines its timing by identifying the peak power position in received signals and adjusting its frame structure accordingly.
Solution Approach 2:
The patent replaces the mechanical/physical backhaul synchronization infrastructure with a signal-processing-based approach. Instead of using dedicated synchronization hardware and protocols over backhaul connections, the system uses RF signal power detection and digital signal processing to achieve timing alignment.
2Measurement precision
If GNSS synchronization is used to provide extremely accurate timing signals, then timing accuracy is improved, but device complexity and equipment costs increase
Solution Approach 1:
The system eliminates the need for external GNSS receivers and synchronization modules by using its own transmitted signals (received by other nodes) as the synchronization reference. Each node uses the peak power detection of received TDD transmissions to determine timing alignment, making the system self-sufficient without additional synchronization equipment.
Solution Approach 2:
The patent replaces expensive, permanent GNSS synchronization infrastructure with a simple, software-based peak power detection mechanism that uses existing transmission signals. This approach uses readily available signal power measurements instead of requiring specialized, costly hardware modules.
3Device complexity
If RF signal based synchronization is used to avoid additional hardware costs, then device complexity is reduced, but measurement precision deteriorates due to propagation delay compensation inaccuracies
Solution Approach 1:
The system performs preliminary timing alignment by detecting the peak power position in received TDD transmissions before actual data transmission begins. The frame structure is pre-configured and pre-synchronized using the detected peak positions, ensuring that uplink and downlink timeslots are properly aligned before operational use.
Solution Approach 2:
The system uses feedback from received signal power measurements to continuously monitor and maintain synchronization. By detecting the peak power levels in incoming TDD transmissions and comparing them against the expected frame structure, the system can detect and correct timing misalignments, ensuring accurate synchronization.
4Adaptability or versatility
If protocol dependent synchronization is used to enable network nodes from different operators, then adaptability is improved, but measurement precision deteriorates due to signal relaying inaccuracies
Solution Approach 1:
The patent implements a universal synchronization mechanism based on peak power detection that works independently of specific communication protocols. The method detects the characteristic peak power pattern in TDD transmissions and uses it for timing alignment, making it protocol-agnostic and compatible with different network operators and equipment vendors.
Solution Approach 2:
Each network node independently performs synchronization by detecting peak power levels in received signals from other nodes. This self-service approach eliminates the need for protocol-specific synchronization signaling or relayed synchronization information, allowing direct and accurate timing alignment between nodes from different operators.
Data Source
AI summary
This disclosure provides a device and method of aligning a transmission frame in a Time Division Duplexing network, wherein the transmission frame includes a sequence of units separated by transition points, wherein each unit includes one or more resource slots in a transmission direction, the method comprising: allocating a transmit power level to a plurality of resource slots in a unit, wherein a transmit power for a first resource slot of the plurality of resource slots is greater than the transmit power for a second resource slot of the plurality of resource slots; measuring the transmit power of a TDD transmission received from an external node to determine a peak transmit power of the received TDD transmission; and substantially aligning the first resource slot to coincide with the peak transmit power of the received TDD transmission.